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Revenue - Significant Increases (Decreases) in Contract Assets and Deferred Revenue (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current Contract Assets [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Acquisitions $ 1.1 $ 0.7
Discontinued operations and disposition of subsidiaries   (15.3)
Current Contract Liabilities [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Acquisitions $ 4.6 7.2
Discontinued operations and disposition of subsidiaries   $ (59.3)